Amulet: The Stonekeepers Curse (Amulet #2)

Emily and Navin's mother is still in a coma from the arachnopod's poison, and there's only one place to find help: Kanalis, the bustling, beautiful city of waterfalls. But when Em, her brother, and Miskit and the rest of the robotic crew aboard the walking house reach the city, they quickly realize that seeking help is looking for trouble, dangerous trouble. A mysterious fox, Leon Redbeard, steps in to help. Miskit is suspicious, Navin is worried about being left behind, and Emily is in the toughest spot of all. She's got to let loose the power of the amulet-without losing herself!